People carrying Emerade 500 microgram adrenaline auto-infector pens should return them and get hold of a prescription for a different brand.

A fault has been detected in the pens, meaning the dose of adrenaline may not be delivered when needed for people with severe allergies.

The official advice comes from the Medicines and Healthcare products Regulatory Agency (MHRA).

Alternative brands – EpiPen and Jext – are available up to 300 micrograms.

“Action has been taken to protect patients, following detection of a fault in one component of the Emerade adrenaline auto-injector pens,” an MHRA spokesperson said.

“Patients should return all Emerade 500 microgram pens to their local pharmacy once they have a new prescription and have been supplied with pens of an alternative brand.”

If an Emerade pen does need to

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